At the moment SMHI only issues predictions for up to three days in advance, but that will soon change to ten days, news agency TT reports.
The forecasts will also take into account wind patterns over Europe, as they blow pollen from trees across Europe over Sweden.
SMHI say they are hopeful the new forecasts will be in place for this upcoming hayfever season, which has been delayed for many parts of the country this year due to the long winter.
Do you suffer from hayfever? How would better forecasts affect you? Comment below!